In the vast reaches of our solar system, Jupiter
reigns supreme as a gigantic mystery, captivating scientists and astronomers for centuries. Just when we think we understand the gas giant,
this celestial behemoth shatters our assumptions. With its blend of unpredictable and often
hostile behavior, mesmerizing storms with winds of up to 640 kilometers per hour [400
miles per hour] and the enshrouded mysteries of concealed metallic oceans within its core,
Jupiter still leaves scientists puzzled. Join us on an extraordinary journey as we
delve into the depths of this enigmatic world, uncovering its secrets. [LOGO] Decades of extensive studies have demonstrated
just how remarkably intricate Jupiter is. Just recently, 12 more moons orbiting the
gas giant have been discovered. The total number of satellites around Jupiter
is now 92, more than any other planet in the solar system. The latest moons discovered have sizes ranging
from 1-3.2 kilometers [0.6-2 miles]. A majority of these moons have extensive orbits,
with 9 out of 12 taking over 550 days to complete one revolution around the planet. Scientists believe that because these distant
moons move in the opposite direction of Jupiter's rotation, they could be captured asteroids. It's been widely believed that Jupiter acts
as a protective shield, safeguarding our planet from threats from outer space. In the past, astronomers have even suggested
that this was one of the reasons life got a chance at evolving on Earth. But recent findings cast doubt on Jupiter's
role as Earth's celestial guardian. Long-period comets, which originate from the
distant regions of the solar system and take millenia to orbit the Sun, typically enter
our vicinity. However, thanks to Jupiter's gravitational
influence, most of these swiftly moving icy objects are flung away from the solar system
before approaching Earth. So the chances of long-period comets colliding
with our planet are extremely rare, occurring over millions or even tens of millions of
years, and Jupiter's presence plays a crucial role in shielding Earth from these potential
impacts. However, the gas giant's gravitational forces
have both positive and negative implications for life on Earth. On one hand, its immense gravity prevents
nearby space rocks from accumulating and forming into a planet. This led to the formation of the asteroid
belt — a collection of numerous small debris fragments scattered between Mars and Jupiter. But nowadays, the gas giant’s gravitational
pull continues to influence asteroids, causing some to deviate toward the sun. This change in their trajectory increases
the odds of collisions with Earth, and we’ve already witnessed it in the past. In 1770, Lexell’s Comet passed just about
a million miles away from our planet — an extraordinary proximity on an astronomical
scale. Scientists believe that this comet had initially
come from the outer reaches of the solar system, and had a close encounter with Jupiter that
redirected its path towards Earth. After completing two orbits around the sun,
the comet returned to a point of close proximity to Jupiter nine years later, which subsequently
ejected it from the solar system. The Jupiter shield theory, supported by previous
computer simulations, suggested that the gas giant ejects countless long period comets
out of the solar system. And this theory even predicted the comet Shoemaker–Levy
9 striking the fifth planet in 1994. But computing resources weren’t as powerful
as they are nowadays and scientists had to make a lot of calculations. Today, we have data that includes a greater
number of short-period comets and near-Earth asteroids that intersect with Earth's orbit
compared to long-period comets. And new simulations demonstrate a different
picture. Jupiter's influential gravity interacts with
the Asteroid Belt, causing gravitational resonances that clear out rogue asteroids and redirect
them inward. Collisions between asteroids can also contribute
to this process by dispersing rocky fragments into resonant zones. The inner edge of the asteroid belt is particularly
affected by a phenomenon known as secular resonance, which drives material into the
inner solar system. Jupiter's current mass allows it to both redirect
comets towards Earth, as seen with Lexell's Comet, and effectively remove them from the
solar system. If Jupiter had only one-fifth of its current
mass, it would still destabilize comets, but lose the ability to remove many of them, leading
to a higher impact rate on Earth. The frequency of impacts plays a crucial role
in the long-term evolution of life on a planet. Earth's geological record indicates that an
impact rate of one major collision every hundred million years provides enough time for the
biosphere to recover and thrive. However, a higher impact rate occurring every
few million years could devastate the planet, hindering the development of a new biosphere. Some scientists believe collisions with Earth
is also how water was brought here. But what about water on Jupiter? Water vapor was first detected on Jupiter
in 1995. This discovery was made by the Galileo spacecraft,
which conducted extensive observations and measurements of the planet and its moons. The onboard instruments of the Galileo spacecraft,
particularly the Near-Infrared Mapping Spectrometer, detected the presence of water vapor in the
planet's atmosphere during its close flyby. But recent data demonstrates water makes up
approximately 0.25% of Jupiter’s atmosphere above the planet’s equator. While this may not sound like a lot, it’s
actually an immense amount of water. Jupiter, probably the first planet to form
in our solar system, contains a significant amount of gas and dust that didn’t become
part of the Sun. Knowing just how much water is locked up in
Jupiter is crucial for scientists studying the formation of the solar system. In recent years, a team of researchers used
telescope data to discover a substantial presence of water within Jupiter's famous Great Red
Spot. Launched by NASA in 2012, the Juno spacecraft
currently orbits the gas giant, taking close-up pictures of its clouds. Equipped with advanced instruments, the spacecraft
has now revealed even more evidence of water on Jupiter. Because this massive gas giant holds more
than double the combined mass of all the other planets in our solar system, even small fractions
of water on such a massive planet would amount to a significant quantity — far exceeding
the amount of water found on Earth. Water in the gas giant’s atmosphere is also
the reason why Jupiter, just like Earth, has its own mesmerizing displays of lightning
a hundred times brighter than terrestrial lightning and peculiar hailstones. Lightning has been detected in the planet’s
water clouds in the past, where water droplets collide with electrically charged ice crystals. But the Juno spacecraft has also spotted dim
lightning at higher altitudes in the atmosphere, where the temperatures drop to approximately
-87°C [-125°F] - too frigid for water to exist in its liquid state. So how does lightning happen under such conditions? The answer to the mystery lies in ammonia,
a remarkable component in Jupiter's atmosphere that serves as a natural antifreeze. In the upper atmosphere, water ice crystals
combine with ammonia vapors and melt. These water-ammonia droplets then collide
with additional ice crystals from below, creating an electrical charge that generates lightning. Below the ammonia ice clouds, the ammonia-water
droplets undergo continuous growth until they become too heavy to remain suspended in the
air, and resemble large hailstones like we have on Earth. Scientists believe that these mushball-like
objects descend deeper into Jupiter's atmosphere. But now, let’s travel even deeper into Jupiter’s
innermost layers. Previously, it was believed that our solar
system's giant worlds all have a rocky core. This was the accepted theory for a very long
time, but recently, scientists have started to doubt this theory. Using Juno's orbit data, scientists are still
studying how matter is distributed inside Jupiter, and recent discoveries have unveiled
an unexpected mystery lurking within the gas giant’s core. Jupiter's core has extremely high pressures,
much greater than on Earth, and temperatures as hot as 20,000°C [36,000°F]. To understand these conditions, scientists
use powerful lasers to compress samples and mimic the planet’s pressures in a laboratory. The Center for Matter at Atomic Pressures
[CMAP] at the University of Rochester is at the forefront of this research. The density of materials in Jupiter's core
depends on their composition and physical properties. And just recently, scientists have discovered
that Jupiter's core is not as compact as they thought it was. Deep within its inner regions, only 18% of
the material is rocky. Jupiter is predominantly made up of hydrogen,
accounting for about 90% of its composition, along with roughly 10% helium and trace amounts
of other elements. In the outer layers of this gas giant, hydrogen
exists as a colorless and transparent gas, in the same form as it exists here on our
planet. As you descend deeper into Jupiter, the increasing
atmospheric pressure transforms hydrogen into a bizarre, dense fluid that conducts like
a metal. So what is this substance? Approximately 10% of the way towards Jupiter's
core, along its radius, the immense volume of hydrogen gas that forms the planet's atmosphere
becomes compressed into a unique form known as liquid metal hydrogen. Liquid metallic hydrogen possesses properties
similar to water, with low viscosity, excellent electrical conductivity, and efficient thermal
conduction. Within Jupiter, this abundant substance transforms
the planet into one huge generator. On Earth, elements exist as solids, liquids,
or gasses, depending on temperature and pressure. While hydrogen is typically a gas on our planet,
it can be compressed and cooled artificially to become a liquid or solid. However, even in these states, hydrogen retains
its non-metallic nature, poorly conducting heat and electricity. In contrast, metals excel at conducting heat
and electricity due to their atom arrangement. Deep within the gas giants of our solar system,
hydrogen undergoes extreme temperature and pressure, which allow for peculiar states
including liquid metallic hydrogen. Hydrogen atoms, under these conditions, shed
their electrons, resulting in a mix of free-floating hydrogen nuclei and electrons. This electron mobility resembles metal behavior. There’s a theory that Jupiter's core might
be filled with vast oceans of this substance, and based on previous estimations of the Jovian
core's mass, it could be 12 to 45 times more massive than our planet. A 40,000 kilometer [25,000 mile] deep layer
of liquid metallic hydrogen, combined with Jupiter's rapid rotation of about 10 hours,
generates a colossal magnetic field that spans an astonishing distance of 725 million kilometers
[450 million miles]. This magnetic field stands as the largest
in our solar system, and it contains mysteries of its own. Exploring regions more than 320 kilometers
[200 miles] down into Jupiter’s atmosphere, scientists have identified a newfound area
known as the Great Blue Spot, not to be confused with Jupiter's Great Red Eye storm. Researchers knew that the Jovian magnetic
field was complex, but they had no idea just how weird it was, and it has something to
do with the Great Blue Spot. The Jovian magnetic field is 20,000 times
stronger than the Earth’s magnetic field. But now scientists have discovered that its
strength is volatile. Unlike the Earth’s dipolar magnetic field,
the gas giant's magnetic field originates from a wide area in the northern hemisphere
and re-enters near the south pole. Researchers have also identified a concentrated
region just south of the equator - the Great Blue Spot. In a way, this area is like a second Jovian
south pole located near the equator. The colossal storm that has raged for centuries
is probably caused by the presence of high concentrations of ammonia in the atmosphere. The intensity of the magnetic fields in the
Great Blue Spot undergoes fluctuations of up to one percent per year, strengthening
and weakening across different regions. By the end of the extended Juno mission in
2025, scientists will have ample evidence to evaluate their hypothesis. As research continues, we're going to encounter
new mysteries about the gas giant. Since the Great Blue Spot and the Great Red
Spot are located at the same latitude, it’s possible the two phenomena are somehow connected. Gas giants are typically characterized by
their high temperatures, especially in their upper atmospheres. In our solar system, there are two such giants
- Saturn and Jupiter. However, Jupiter doesn’t have a consistently
high temperature throughout its entire structure. The solar system’s largest planet is mostly
known for its massive storm twice the size of Earth - the Great Red Spot, but the gas
giant has other spots too. The Great Cold Spot is nearly as large, and
scientists have been observing this phenomenon for years now. At its largest, the spot is approximately
12,000 by 24,000 kilometers [7,500 by 15,000 miles] across. But unlike the famous Red Spot, this intriguing
atmospheric feature stands out as a region of significantly colder temperatures compared
to its surroundings, about 200°C [400°F] cooler than the surrounding atmosphere. The Great Cold Spot is volatile, disappearing
and reappearing from time to time. Scientists have discovered that the phenomenon’s
recurrence is triggered by the planet’s auroras. Because of this correlation, the spot’s
age is about the same as the age of Jupiter’s polar lights, which is in thousands of years. Jupiter's auroras, similar to Earth's, are
produced by charged particles interacting with the planet's atmosphere near the poles. However, the gas giant’s polar lights are
more stable and intense as they receive particles from both its moons and the Sun. New findings indicate that these auroras transfer
energy to Jupiter's atmosphere, creating a temperature difference between the upper and
lower regions. This temperature contrast leads to the formation
of a swirling vortex, resulting in a cooler patch that is distinct from the aurora and
its surroundings. Earth also experiences similar effects. However, the combination of factors, like
Jupiter's rotation that helps retain heat in specific areas and the varying nature of
these events, makes the occurrence of polar lights on our planet less consistent. Another discovery made about the gas giant
was that, contrary to common belief, Jupier doesn’t actually orbit the sun. The center of gravity between Jupiter and
the Sun does not reside within the Sun itself but instead exists at a specific point just
above the Sun's surface. In space, when a smaller object seemingly
orbits a larger one, both objects actually orbit around a combined center of gravity. Consider Earth and the Sun, for instance. In this case, the center of gravity is so
close to the center of the larger object that its impact is hardly noticeable. The larger object appears motionless, while
the smaller object traces a seemingly perfect circular path around it. The same happens when the International Space
Station orbits the Earth. Both the Earth and the ISS orbit around their
shared center of gravity, even though our planet seems to be completely stationary while
the ISS appears to orbit the Earth in perfect circles. This principle generally holds true for most
planets in our solar system. Even Saturn has negligible influence on the
Sun's position in space. However, as the difference in mass between
the two objects decreases, everything changes. In the case of Jupiter, its immense size causes
the center of mass, known as the barycenter, to exist 1.07 solar radii away from the Sun's
center, approximately 7% of a solar radius above the Sun's surface. This means that both the Sun and Jupiter orbit
around this particular point in space. As the voyage of discovery continues, the
enigmatic depths of Jupiter hold even more surprises yet to be unveiled. Stay tuned here to be the first to witness
cosmic newfound wonders, and thanks for watching!
